Reflex control of total cardiac output and total peripheral resistance is controlled by:
A) parasympathetic stimulation of heart,arterioles,and veins.
B) sympathetic stimulation of heart,arterioles,and veins.
C) autonomic control of the heart only.
D) somatic control of the heart,arterioles,and veins.

Question

Quizplus · Accepted Answer

The reflex control of total cardiac output and total peripheral resistance is primarily regulated by sympathetic stimulation of the heart, arterioles, and veins. The sympathetic nervous system increases heart rate and contractility, constricts arterioles to increase peripheral resistance, and constricts veins to increase venous return and preload. Parasympathetic stimulation tends to have the opposite effect, decreasing heart rate and contractility, and dilating blood vessels. Autonomic control affects both heart and blood vessels, not just the heart, and somatic control is not involved in the reflex control of these variables.

Reflex Control of Total Cardiac Output and Total Peripheral Resistance